Laboratory evaluation of colloidal actinide transport at the Waste Isolation Pilot Plant (WIPP): 1. crushed-dolomite column flow... Page: 9 of 16
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Typical results are illustrated in Figure 5. Elution curve profiles from the final experiments were
analyzed using the approach described earlier. -Very little filtration of the humic substances was
observed (Table 2). This result was anticipated because humic substances, in their ionic form,
are dissolved macromolecules and are essentially not susceptible to physical (straining) filtration
as are microbes and mineral fragment. The experiments showed that the humic substances eluted
at the same number of pore voluImes as- fluorescein dye, 4he nonsorbing tracer, indicating that
enhanced transport of humic substances did not occur. A hypothesis that was rejected based on
these tests was the possibility that the >Mg and >Ca surface functional groups of the dolomite
would have reacted with the humics, resulting in sorption.
Transport experiments using sieved, uniformly packed crushed Culebra rock demonstrated that
mineral fragments and fixed and live WIPP-relevant bacteria cultures were significantly retarded
due to physical filtration effects, but humic substances were not attenuated by the Culebra
dolomite. Comparison of elution curves of latex microspheres in columns prepared with
microcrsytalline rock and nonporous rock showed minimal effect of Culebra micropores on
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Francis, A.J., and J.B. Gillow. 1994. Effects of Microbial Processes on Gas Generation Under
Expected Waste Isolation Pilot Plant Repository Conditions. Progress Report Through 1992.
SAND93-7036. Albuquerque, NM: Sandia National Laboratories.
Harvey, R.W., and S.P. Garabedian, 1991. "Use of Colloid Filtration Theory in Modeling
Movement of Bacteria through a Contaminated Sandy Aquifer," Environmental Sciences and
Technology, Vol. 25, p. 178-185.
Jacquier, P. 1991. "Geochemical Modelling: What Phenomena are Missing?" Radiochimica
Acla Vol. 52/53, pt. 2, 495-499.
Kelley, V.A., and G.J. Saulnier, Jr. 1990. Core Analyses for Selected Samples from the Culebra
Dolomite at the Waste Isolation Pilot Plant Site. SAND90-7011. Albuquerque, NM: Sandia
Lucero, D.A., F. Gelbard, Y.K. Behl, and J.A. Romero. 1995. "Test Plan for Laboratory Column
Experiments for Radionuclide Adsorption Studies of the Culebra Dolomite Member of the
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Yelton, W.G.; Behl, Y.K.; Kelly, J.W.; Dunn, M.; Gillow, J.B.; Francis, A.J. et al. Laboratory evaluation of colloidal actinide transport at the Waste Isolation Pilot Plant (WIPP): 1. crushed-dolomite column flow..., article, December 31, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc681657/m1/9/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.